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Oscillogram and RMS voltage

  1. Oct 15, 2011 #1
    1. The problem statement, all variables and given/known data
    [PLAIN]http://img16.imageshack.us/img16/7396/oscf.jpg [Broken]

    What is the RMS voltage of the top wave?

    2. Relevant equations
    RMS... root mean square

    3. The attempt at a solution
    If I'm right, the peak voltage is 1 V (gotten from 2 * 500mV). Square of 1 is 1. And there are 4 peaks, so 1 + 1 + 1 + 1 = 4. Mean is 4 / 4 = 1. Then sqrt of 1 is 1. So my final answer is 1 V. Is this right?
    Last edited by a moderator: May 5, 2017
  2. jcsd
  3. Oct 15, 2011 #2


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    Staff: Mentor

    It looks to me like the top wave is plotted at 1V/division. Isn't that what this bit implies:


    Attached Files:

  4. Oct 18, 2011 #3


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    Staff: Mentor

    I assume this is a sinewave. Have you studied the RMS value of a sinewave? If not, then use a google search.

    No. Not even close, I'm afraid.
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